Symptoms of facial allergy include the following: 1. Flaky or diffuse erythema of the skin: the patient is accompanied by a varying degree of swelling, and there may be dense small pimples or blisters on the erythema, or it may be a separate edematous erythema.2. Skin infection: severe allergic rashes may also be exudative, and there may also be a state of secondary infection of the skin.3. Discomfort: the common symptoms are skin Itching, or a burning, pins and needles, swelling. Facial allergies are related to many factors, including the replacement of skin care products, exposure to special environments, as well as food and medications, which may lead to facial allergies. Therefore, when redness, swelling, pimples and blisters suddenly appear on the facial skin, accompanied by itching and other uncomfortable feelings, it is best to go to the dermatology department of the hospital for professional treatment, subject to the clinician’s advice.